Android is a software stack for mobile devices that includes an operating system, middleware, and key applications. The Android SDK provides the tools and libraries necessary to begin developing applications that run on Android-powered devices.
This site provides information about Google projects based on the Android platform, such as external libraries that extend the platform, hosted services and APIs, and more. Everything on this site is provided by Google for the benefit of Android developers. If you are interested in developing applications for Android devices, please visit the Android Developers site at developer.android.com